英语翻译two hours walking还是 two hours‘ walking加不加表示的那一个“'”?呢

英语翻译two hours walking还是 two hours‘ walking加不加表示的那一个“'”?呢 They are very after walking for two hours.怎么填? She spent two hours walking there同意句 After walking for two hours without a rest,they were all out 1,yesterday we spent tuo hours walking around the park(对two two hours less than two hours 还是fewer than two hours in two hours 和in two hours' time的区别 in two hours 和for two hours的区别 more two hours和two more hours的区别 英语翻译He spent three hours walking through the forest 还是：He sp Two hours' ///////// A two-hour